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* very few land places have a land antipode #maps (Image source: https://en.wikipedia.org/wiki/Antipodes)
@mdione wait a minute, so the continents are flipped?!
@yellowlime doubly flipped, vertically and horizontally.
The math is simple: in terms of latitude, if you're at Y degrees South, your antipode is Y degrees North and viceversa.
Longitude is a little bit more complex, but not that much. if you're X degrees East of the Greenwich Meridian, your antipode is the same amount of degrees East of the Antimeridian (180˚). If, like currently, we consider East degrees as positive and West degrees as negatives, then your antipodes is at (180 + Y) mod 180.
@yellowlime the mod 180 is to cover positives Ys that give an amount bigger that 180.
To summarize, if you live at (X, Y), your antipodes is at:
X' = -X
Y' = (180 + Y) mod 180
The first one gives you the flip around the Equator. The second one the vertical flip. The map above is not quite using the Greenwich Meridian but 20° West, but the selection of the GWM is completely arbitrary, so is this one.